How did Ben McKenzie, an actor still most famous decades later as the hunky star of “The O.C.” end up testifying before Congress and emerge as the face of crypto critics with his documentary “Everyone Is Lying to You for Money”?

“It’s pretty much what you see in the movie. There was the pandemic. I was bored, looking for something to do,” McKenzie, 47, said in a Zoom interview.

“Because I’ve made a lot of TV” – most notably “Southland” and “Gotham” – “you obviously couldn’t make TV in the throes of the pandemic.

“And at that time Bitcoin was everywhere. Celebrities” – most prominently we see Matt Damon – “were hawking. It was skyrocketing in price.

“Dave, a buddy of mine, said I should…